[Test] Minor change to trigger a RTD build (hopefully)

[gmacario]

📑 Description

Test case for #251

✅ Checks

• [ ] My pull request adheres to the code style of this project
• [ ] My code requires changes to the documentation
• [ ] I have updated the documentation as required
• [ ] All the tests have passed

ℹ Additional Information

[gmacario]

PROBLEM: Even this branch (which is basically aligned to main) does not trigger https://readthedocs.org/projects/arneis/builds/ any longer